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2003 1st Quarter Groundwater Report Frontier Transportation June 4, 2003 Page 4 low of 100 µg/L /The last groundwater sample collected from MW-3 prior to abandonment I detected dissolved TPH-g as 9,750 µg/LDissolved TPH-g concentrations in MW-1 have attenuated from 1,800 µg/L in August 1996 and remained under 50 gg/L since January 2000 Groundwater collected in 3003 from thirteen groundwater monitoring wells identified dissolved TPH-g concentrations exclusively in MW-3R as 798 µg/L using EPA I method 8015 modified-The previous episode performed in January 2003 identified 1,540 [ig/]L as TPH-g in MW-3R All other monitoring wells identified no detectable concentrations of dissolved TPH-g from the first quarter 2003 sampling episode Please see Figure 4 for recent dissolved TPH-g isoconcentration map �_ y� ai �°� �mov� Historically no detectable concentrations �V-9, lved BTEX were identified in monitoring wells MW�, MW-6, MW�7, MW-8, MW-10 .and MW-11 since initial groundwater testing began in each well Monitoring wells MW_�, MW-2, and MW-4 have I remained non detect since at least July of 1999 Only monitoring well MW-3, which was replaced by MW-3R, contained dissolved BTEX from every groundwater sampling episode -- No detectable concentrations of dissolved BTEX were identified in groundwater samples lie collected in April 2003 from monitoring wells MW-2, MW-4, MW-5, MW-6, MW-7, MW-8, MW-10, MW-11, MW-12 and MW-13 using EPA method 8020-'--Monitoring wells MW-1 and MW-9 identified low-level concentrations of BTEX as 0 9 µg/L (exclusively ethylbenzene) and I 0 8 µg/L (as tol'uen and xy41ene), respectively Groundwater collected fr m replacement well MW-3R identified dissolved BTEX as 150 6 µg/L,, a decrease from gg/L identified in January 2003 See Figure 5 for the recent dissolved BTEX Isoconcentration Map 1 q"0 MTBE was the only oxygenate identified in groundwater using EPA method 8260 from NO p the first quarter 2003 sampling episode Monitoring well MW-1 identified dissolved MTBE concentrations 120 gg/L;decrease from the maximum 5,800 µg/L identified in October 2002 Dissolved MTBE was also identified in June 2002 as 230 gg/L The depth to groundwater in MW-1 was recorded as its lowest level (10 75') in June and October 2002, which coincides with the observance of increasing dissolved MTBE concentrations Monitoring Tell MW-3 identified a maximum dissolved MTBE concentration of 29,400 µg/L in March 1998 Replacement well MW-3R identified a maximum dissolved MTBE concentration as 5,500 µg/L in January 2003 First quarter 2003 groundwater analysis identified dissolved MTBE at 2,800 pg/L-No detectable concentrations of other oxygenates were identified from groundwater sample analysis of they Aq, w monitoring wells sampled using EPA method 8260 (See Appendix B) See Figure 6 for the\ p� �J `? recent MTBE Isoconcentration Map �n p M 1 I